CN100559066C - Phosphorus membrane uses its lighting device and display unit - Google Patents
Phosphorus membrane uses its lighting device and display unit Download PDFInfo
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- CN100559066C CN100559066C CNB2006100886111A CN200610088611A CN100559066C CN 100559066 C CN100559066 C CN 100559066C CN B2006100886111 A CNB2006100886111 A CN B2006100886111A CN 200610088611 A CN200610088611 A CN 200610088611A CN 100559066 C CN100559066 C CN 100559066C
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Abstract
The present invention has realized a kind of phosphorus membrane, and this phosphorus membrane has the fabulous fluorescent characteristic of performance aspect moistureproof; Utilize described phosphorus membrane that a kind of liquid crystal indicator is provided in addition, this liquid crystal indicator has fabulous humidity resistance and gratifying colorimetric properties and mixture of colours characteristic.Be mixed with phosphor microparticle in adhesive, this phosphor microparticle is excited by incident ray and launches the light with the wavelength that is different from incident ray.The described adhesive that is mixed with phosphor microparticle as phosphor layer between semitransparent thin film and watertight composition to form phosphorus membrane.This phosphorus membrane at least between the light source and photoconduction of lighting device, on the light irradiation surface of photoconduction and between photoconduction and the reflecting plate in the position in these three positions.In addition, described phosphor microparticle has such characteristic, that is: the wavelength that is shown the filter absorption of element is set to excitation wavelength, and emission wavelength is in the zone of being transmitted by filter.Adopt such phosphorus membrane, can realize having the display unit of very high luminous efficiency and Color reproduction ability.
Description
Technical field
The present invention relates to be used for the to throw light on lighting device of display element of uses such as portable information apparatus, portable phone and the display unit of using this lighting device relate in particular to the phosphorus membrane that uses in this lighting device.
Background technology
In recent years, in portable phone, mobile computer etc., adopted the liquid crystal indicator that utilizes little energy consumption to obtain high resolution color picture as display.Because described liquid crystal indicator is non-luminous non-self-emission display apparatus, therefore, it needs lighting device.In lighting device, often ultraphotic (superluminescent) white hair optical diode is used as light source.
Especially, in portable phone, will use reflection-type liquid-crystal display device or two-sided visual type liquid crystal indicator, wherein reflection-type liquid-crystal display device has big and bright windowing (opening), and two-sided visual type liquid crystal indicator can be in two sides displays image information before and after it.Often adopt and use the lighting device of ultraphotic (superluminescent) white hair optical diode to come the liquid crystal cell in the liquid crystal indicator is thrown light on.Usually, in described white hair optical diode, be provided with green or the yellow phosphor that is dispersed in the resin as the light emission surface of the blue-led element of light source.The green glow that is obtained by green phosphor or yellow phosphor or the blue light of gold-tinted and blue-led element are to obtain white light (referring to JP10-107325A).Known, in having the white LEDs of this structure, owing to the luminous intensity height that is radiated on the phosphor, therefore, the light deterioration for fear of phosphor applies phosphor (referring to JP7-176794A) in the rear surface of photoconduction with predetermined component density.In addition, carry out the wavelength conversion, lamination wavelength converting member (referring to JP10-269822A) can be set between the light incident surface of blue LED element and photoconduction in order to use than the phosphor in the zonule.
Liquid crystal indicator uses the redness (R) on the liquid crystal board, green (G) and blue (B) filter to select essential color from the light that white LEDs sends, and in addition, this liquid crystal indicator is also selected the switching function of liquid crystal cell and shown described color.
Figure 21 is a chromatic diagram, and it is used to illustrate the glow color under the situation of using the yellow phosphor particulate that blue light is converted into gold-tinted.Represent the gold-tinted that excites by blue light (colourity 44 among the figure) with colourity 45.Therefore, thus intensity that can be by changing blue light or regulate the glow color that ratio between blue light strength and the yellow light intensity obtains any colourity on the line between colourity 44 and the colourity 45 by the concentration of regulating the yellow phosphor particulate.Under these circumstances, strictly, owing to include composition except gold-tinted in the light that obtains by converting blue light, therefore, can represent to have the colourity on the line of the width between colourity 44 and the colourity 45.Yet, because it is wide inadequately to connect the line of colourity 44 and colourity 45, so, gamut can not be represented among Figure 21 by the color of only using blue light and yellow phosphor to regenerate by the indicated big color triangle 103 of RGB.
In order to address this problem; preferably phosphor microparticle is blended in the adhesive and uses; by obtaining described phosphor microparticle with estimated rate mixing green phosphor particulate and red-emitting phosphor particulate; this green phosphor particulate is converted to green glow with blue light, and this red-emitting phosphor particulate is converted to ruddiness with blue light.So-called chalcogenide composite phosphor particulate, for example the Te compound of S compound, Se compound or doped with rare-earth elements all is suitable as described phosphor microparticle.The chromatic diagram of this situation has been shown among Figure 20.In Figure 20, the green glow that emission is had colourity 42 by blue-light excited green phosphor particulate with colourity 41.The ruddiness that emission is had colourity 43 by blue-light excited red-emitting phosphor particulate with colourity 41.The luminous intensity of green glow and ruddiness depends on the melting concn of wavelength conversion efficiency and green phosphor particulate and red-emitting phosphor particulate and as the intensity of the blue light of excitation line.Therefore, blending ratio that can be by regulating green phosphor particulate and red-emitting phosphor particulate and melting concn and change blue light strength obtain with the triangle that is connected colourity 41,42 and 43 in the relevant light of all colours.As can be seen, because this triangle has occupied the overwhelming majority of the color triangle of representing with RGB 103, so the scope of Show Color is increased.
Yet when chalcogenide composite phosphor particulate absorbed moisture, its characteristic will degenerate.Therefore, using described chalcogenide composite phosphor particulate regularly is the comparison difficulty.
Like this, have thin film of phosphor and the light that comes from light source is carried out under the situation of wavelength conversion with the conventional method that obtains white light using according to additive color mixture color stimulus (additive mixture colorstimuli), especially, when using the so-called chalcogenide phosphor that obtains by doped with rare-earth elements in S compound, Se compound, Te compound or similar material with high light line conversion efficiency, the moisture that described phosphor can be existed in the environment worsens.Therefore, can not carry out effective color mixture again through after the distance.
Summary of the invention
The purpose of this invention is to provide a kind of phosphorus membrane, even when adopting the chalcogenide phosphor, this film also has long service life; In addition, the present invention also will provide a kind of liquid crystal indicator, and this liquid crystal indicator will can obviously not be subjected to the structure influence of photoconduction and have an effective wide Color reproduction scope by using described phosphorus membrane.
Because white LEDs emission only by blue light and green light being mixed the white light of the secondary colour that obtains, so the Wavelength distribution of the traditional white LEDs that uses in the lighting device of liquid crystal indicator will widely cover the crest at 450nm and 580nm place.On the other hand, the peak value of filter that uses in the liquid crystal indicator or the selected wavelength of analog is 450nm for blueness, is 530nm for green, is 600nm for redness.In other words, in the light that white light source sends, the wavelength of 480nm to 510nm and 570nm to 590nm will be by filtering, and has by the light of the wavelength of filtering and absorbed by filter.Therefore, another object of the present invention provides a kind of lighting device, and it can effectively utilize by the wavelength of the part of filter filtering, and it can realize efficient illumination in addition, and has very high Color reproduction ability.
In phosphorus membrane of the present invention, on the semitransparent thin film base material, form and have the phosphor layer that is blended in the phosphor microparticle in the adhesive, the surface coverage of described phosphor layer has watertight composition, and described watertight composition is made of impermeable material, and it prevents described phosphor layer contact wetting.
Lighting device according to the present invention comprises phosphorus membrane, and in this phosphorus membrane, formation has the phosphor layer that is blended in the phosphor microparticle in the adhesive on the translucent base material.In described phosphor microparticle, excitation wavelength (excitation wavelength) will be absorbed by filter.The emission wavelength of described phosphor microparticle is in the zone of the wavelength that is transmitted by filter.
When described semitransparent thin film is thin, can be by forming described semitransparent thin film with waterproof material or on described semitransparent thin film, forming second watertight composition, on this second watertight composition, apply phosphor layer, then with first watertight composition cover described phosphor layer with the water separation in described phosphor layer and the environment from.The result is to keep the characteristic of phosphor microparticle in a very long time.
Lighting device according to the present invention comprises: light source; Phosphor microparticle, the optical excitation that it is sent by described light source, and send light with the different wavelength of the light wavelength sent with described light source; Photoconduction, its conduction comes from the light of described light source, and with the shape irradiation of light with the plane; Phosphor layer, it forms by hybrid phosphor particulate in adhesive, and wherein said phosphor layer is clipped in the middle of semitransparent thin film and the watertight composition.
In addition, be provided with an optical element on the emission surface side of photoconduction, described phosphor microparticle is excited by the light in the zone, and this light does not penetrate described optical element, and this zone is the wavelength region may of the light that sends of light source; Described in addition phosphor microparticle emission has the light of the wavelength that penetrates described optical element.
In this case, described phosphor layer is between described light source and described photoconduction or be positioned on the emitting surface of described photoconduction.In addition, at the rear side of described photoconduction a reflecting plate is set, described phosphor layer is between described photoconduction and described reflecting plate.
In addition, described light source is a blue-light source, and described phosphor microparticle comprises blue light is converted to the green phosphor particulate of green glow and the red-emitting phosphor particulate that blue light is converted to ruddiness.As selection, described light source comprises ultraviolet source and blue-light source, and employed phosphor microparticle comprises the red-emitting phosphor particulate that ultraviolet ray is converted to the green phosphor particulate of green glow and ultraviolet ray is converted to ruddiness.
In addition, described phosphor layer comprises: first phosphor layer, and it comprises first phosphor microparticle, this first phosphor microparticle is also launched the light that is in first wave-length coverage by the optical excitation that light source sends; And second phosphor layer, it comprises second phosphor microparticle, optical excitation that this second phosphor microparticle is sent by light source and emission are in the light in second wave-length coverage.
Herein, emission has that of light of shorter wavelength among described light source side disposes first phosphor layer and second phosphor layer.As selection, described first phosphor layer and second phosphor layer are configured in the plane avoiding and overlap therebetween.
In addition, when described phosphor layer was between described light source and photoconduction, the melting concn of described phosphor microparticle was set to the closer to the interior concentration in the zone of light source big more.
In addition, photoconductive tube comes from the light of light source with conduction between light source and photoconduction, and it also makes light incide on the photoconduction with linearity configuration.In described photoconductive tube, form phosphor layer, and a watertight composition that is used to cover the whole surface of described photoconductive tube is set.Described second phosphor microparticle can be arranged between the light incidence surface of photoconductive tube and photoconduction.
Display unit according to the present invention comprises that this light is from light source incident from the photoconduction of emitting surface emission light; Be included in the display element that is provided with on the emission surface side of photoconduction in addition.At the phosphor layer that is provided with on the light path between light source and the display element between semitransparent thin film and watertight composition.In described phosphor layer, phosphor microparticle is dispersed in the adhesive, and the optical excitation that this phosphor microparticle is sent by light source and launching has the light of the wavelength that is different from the light wavelength that light source sends.Described phosphor microparticle has such characteristic, that is: this phosphor microparticle is excited by the light in the zone, and this light can be shown the filter filtering that is provided with in the element, and this zone is the wavelength region may of the light that sends from light source; In addition, this phosphor microparticle is also launched the light of the wavelength with penetrable filter.
When in use is transmitted in the visible region, comprising the light source of pseudo-white light of two crests, and when display element has the filter that is formed by red color filter, green color filter and blue color filter, can be with adopting by 480nm to the optical excitation of 490nm and launch the phosphor microparticle of the light of 600hm.
Selectively, when in use is transmitted in the visible region, comprising the light source of pseudo-white light of two crests, also can adopt such phosphor microparticle, the interior light of wavelength region may that this particulate is in one of them peak value excites, and emission is in the interior light of wavelength region may except that described two peak values.
Description of drawings
In the accompanying drawings:
Fig. 1 shows the sectional view according to the structure of phosphorus membrane of the present invention;
Fig. 2 shows the sectional view according to the structure of lighting device of the present invention;
Fig. 3 shows the sectional view according to the structure of lighting device of the present invention;
Fig. 4 shows the sectional view according to the structure of display unit of the present invention;
Fig. 5 shows the sectional view according to the structure of lighting device of the present invention;
Fig. 6 shows the wavelength and the transmissivity of the filter of color liquid crystal panel;
Fig. 7 shows the wavelength of white LEDs and the correlation between the brightness;
Fig. 8 shows the wavelength conversion characteristics chart of the phosphorus membrane that uses among the present invention;
Fig. 9 shows the wavelength-light characteristic when with phosphorus membrane and white LEDs combination;
Figure 10 shows the sectional view according to the structure of phosphorus membrane of the present invention;
Figure 11 shows the schematic diagram according to the structure of lighting device of the present invention;
Figure 12 shows the schematic diagram according to the structure of lighting device of the present invention;
Figure 13 shows the schematic diagram according to the structure of lighting device of the present invention;
Figure 14 shows the schematic diagram according to the structure of lighting device of the present invention;
Figure 15 shows the perspective view according to the structure of lighting device of the present invention;
Figure 16 shows the perspective view according to the structure of lighting device of the present invention;
Figure 17 shows the schematic diagram according to the phosphor layer that uses in the lighting device of the present invention;
Figure 18 shows the schematic diagram according to the phosphor layer that uses in the lighting device of the present invention;
Figure 19 shows the schematic diagram according to the phosphor layer that uses in the lighting device of the present invention;
Figure 20 shows the chromatic diagram according to the colorimetric properties of lighting device of the present invention;
Figure 21 shows the chromatic diagram of the colorimetric properties of traditional lighting device;
Figure 22 shows the sectional view according to the structure of liquid crystal indicator of the present invention.
The specific embodiment
Phosphorus membrane according to the present invention comprises phosphor microparticle, and its light that is incided on it excites, and emission has the light of the wavelength that is different from described light; Comprise phosphor layer in addition, it forms by phosphor microparticle is mixed in the adhesive.Described phosphor layer is clipped between semitransparent thin film and the watertight composition.This structure has been shown among Fig. 1.As shown in FIG., semitransparent thin film 1 is provided with and has the adhesive that is dispersed in phosphor microparticle wherein.The layer that includes adhesive 2 and phosphor microparticle 4 is called as phosphor layer.Watertight composition 3 covers on the phosphor layer to protect not contact wetting of phosphor microparticle 4.According to phosphorus membrane,, can guarantee that also the characteristic of phosphor microparticle can be by the moisture effects in the environment in distance even the chalcogenide phosphor material is used as phosphor microparticle with this structure.Therefore, even owing to adopt the chalcogenide phosphor material with high color conversion efficiency also can reach high humidity resistance, so, can be with phosphorus membrane according to the present invention as the wavelength switching film.Therefore, the light that can adopt phosphorus membrane to come light source is sent in many application carries out the wavelength conversion, reduces power attenuation, reduces size and reduces the thickness of color light source thereby can impel.
Lighting device according to the present invention comprises light source, phosphor microparticle, and the optical excitation that it is sent by light source and sending has the light that is different from the light wavelength that light source sends; Photoconduction, its conduction come from the light of light source and launch light with flat shape; Comprise phosphor layer in addition, it forms by hybrid phosphor particulate in adhesive.Described phosphor layer is between semitransparent thin film and watertight composition.Because this structure can improve humidity resistance, therefore can obtain to have the long life-span, the lighting device of big chroma areas and high light utilization ratio, can obtain the gratifying colour lighting device that is used to illuminate the plane in addition.
In addition, lighting device according to the present invention comprises: light source; Photoconduction, its light that light source is sent incides on it, and emits beam from emitting surface; Phosphorus membrane with semitransparent thin film, the surface of this semitransparent thin film has phosphor layer, and this phosphor layer comprises and has the adhesive that is dispersed in phosphor wherein; On the emission surface side of photoconduction, has optical element.Described phosphor has such characteristic---and be that described phosphor is excited by the light in the zone, this light does not penetrate described optical element, and this optical element is in the wavelength region may of the light that light source sends; Described in addition phosphor emission has the light of the wavelength that penetrates described optical element.
Described phosphorus membrane must between between light source and the photoconduction or be positioned on the emitting surface of photoconduction or under.Watertight composition can be set to cover described phosphor layer in described phosphorus membrane.
Display unit according to the present invention comprises light source; From the photoconduction of emitting surface emission light, this light incides on the photoconduction from light source; Phosphorus membrane with semitransparent thin film, the surface of this semitransparent thin film has phosphor layer, and this phosphor layer comprises and has the adhesive that is dispersed in phosphor wherein; The emission surface side of photoconduction is provided with display element.Described phosphor has such characteristic---and being described phosphor is excited by the light in the zone, and this light can be shown the filter filtering that is provided with in the element, and this zone is the wavelength region may of the light that sends from light source; In addition, this phosphor is also launched the light of the wavelength with penetrable filter.By adopting this structure, the colorimetric properties of described element can improve, and can obtain the high-resolution color liquid crystal display arrangement.
In addition, light emitted comprises the pseudo-white light of two crests in the visible region, and described filter is made of red color filter, green color filter and blue color filter; Described phosphor can be by 480nm to the optical excitation of 490nm and launch the light of 600nm.
Selectively, light emitted comprises the pseudo-white light of two crests in the visible region, and the interior light of wavelength region may that described phosphor is in one of them crest excites, and emission is in the interior light of wavelength region may except that described two crests.
Described phosphor is made of first phosphor and second phosphor, and this first phosphor is also launched the light that is in first wavelength region may by the optical excitation that light source sends; This second phosphor is also launched the light that is in second wavelength region may by the optical excitation that light source sends.In this case, the phosphor that emission has short wavelength's light is set on described light source side.Selectively, described first phosphor and second phosphor are set in one plane not overlap each other.
Described phosphor is big more with concentration that the melting concn of phosphor microparticle is set in the zone of light source between light source and photoconduction.
Selectively, can regulate the intensity of the light that sends from photoconduction by the melting concn that changes phosphor microparticle according to the position in the phosphor.For example, the luminous intensity that is set to light source of the melting concn of phosphor microparticle is scattered in inverse proportion.
Lighting device according to the present invention has photoconduction, and its conduction comes from the light of light source and the waveform transformation light that obtains by the excitation phosphor particulate, and with the flat shape irradiates light.Described lighting device adopts phosphorus membrane, in this phosphorus membrane, forms phosphor layer in the adhesive by phosphor microparticle is mixed to be dispersed in, and this phosphor layer is covered by first watertight composition and forms in semitransparent thin film.Described phosphor layer can be covered by first watertight composition and second watertight composition.Blue-light source will be used as light source.The red-emitting phosphor that blue light is converted to the green phosphor of green glow and blue light is converted to ruddiness is provided with in the mode that is spatially separated from each other.Position in comparatively close described light source side is provided with the phosphor of launching the light with shorter wavelength in two kinds of phosphors.By adopting this structure, can under the situation of the transport properties that does not change photoconduction, utilize uniform phosphor to distribute and realize high efficiency wavelength conversion.Because therefore the form setting of phosphor layer to be spatially separated from each other can be arranged on the phosphor layer with low wavelength conversion efficiency near the light source.The result is to make the look conversion efficiency maximization of each color.In addition, because phosphor microparticle is not subjected to the moisture effects in the environment, therefore can prolong the service life of lighting device self.
Also ultraviolet source and blue-light source can be used as light source.Ultraviolet ray is converted to the green phosphor layer of green glow and the red phosphor layer that ultraviolet ray is converted to ruddiness is used as phosphor layer.Therefore, can realize having the green emission and the red emission of high illumination efficiency, also can be by green glow and ruddiness are mixed the liquid crystal indicator that obtains to have big Color reproduction scope with blue light.
When ultraviolet source was used as light source, phosphor layer was between the incidence surface of light source and photoconduction, and the ultraviolet radiation absorption film is between the incidence surface of phosphor layer and photoconduction.By adopting this structure, for example can avoid that the such polymerization parts of photoconduction are worsened by ultraviolet ray, and prolong the service life of described lighting device.
Can be by hybrid phosphor particulate in polymeric binder and with predetermined shape printing or be applied to and form phosphor layer on the semitransparent thin film.On phosphor layer, form watertight composition.In described phosphor layer, first phosphor layer and second phosphor layer in one plane do not overlap mutually, and in described first phosphor layer, first phosphor microparticle is dispersed in the polymeric binder; In described second phosphor layer, second phosphor microparticle is dispersed in the polymeric binder.By adopting this structure, available phosphor layer is converted to multicolour with wavelength.Because phosphor does not overlap mutually, thus the generation of the situation that the light that can reduce phosphor is absorbed by other phosphors, and improved wavelength conversion efficiency fully.In this case, size that can be by reducing the zone that different phosphor layers form fully and each zone is adjacent to each other so that can carry out wavelength change and improve mixture of colours characteristic under the situation that does not produce unevenness of tint.Like this, can be by covering the characteristics life that described phosphor layer prolongs phosphor with first watertight composition or second watertight composition.
The superficial density of the phosphor microparticle that is scattered is set to essential and excites light intensity proportional.So just can obtain to have the liquid crystal indicator of uniform mixture of colours ratio.
Photoconductive tube comes from the light of light source so that it incides on the photoconduction linearly with conduction between light source and photoconduction, be formed with phosphor layer in photoconductive tube, covers the whole surface of described photoconductive tube with watertight composition.
As selection, the ratio that first phosphor microparticle and second phosphor microparticle can be scheduled to is dispersed in the photoconductive tube to carry out the wavelength conversion and the mixture of colours simultaneously in photoconductive tube.The surface coverage of described photoconductive tube has watertight composition.Because described phosphor is dispersed in the described photoconductive tube, therefore can under uniform and high light intensity, carries out the wavelength conversion, and can improve wavelength conversion efficiency.In described photoconductive tube, owing to repeat multipath reflection from the light of light source, so also can improve the mixture of colours characteristic of light.Because photoconductive tube covered by watertight composition, so can protect the not moisture in the contact environment and can prolong service life of phosphor of phosphor.
As selection, first phosphor microparticle can also be placed photoconductive tube, cover the whole surface of photoconductive tube with watertight composition, with second phosphor between the light incident surface of photoconductive tube and photoconduction.By adopting this structure, can equably described phosphor blend be dispersed in and also can realize more uniform look conversion in the described photoconductive tube.Owing to be radiated at the intensity of the light on the phosphor layer also is uniformly, therefore, can apply phosphor equably on described phosphorus membrane.This makes that described phosphorus membrane is easy to make.
Described phosphorus membrane, lighting device and display unit will describe in detail with accompanying drawing in the back.
[first embodiment]
Below in conjunction with accompanying drawing 1 structure according to the phosphorus membrane of first embodiment of the invention is described.As shown in FIG., in phosphorus membrane 9, phosphor microparticle 4 is blended in the adhesive 2 and is applied on the semitransparent thin film 1.The layer that comprises adhesive 2 and phosphor microparticle 4 is called as phosphor layer.Watertight composition 3 covers on the phosphor layer to protect not contact wetting of phosphor microparticle.
Suitably select the material of phosphor microparticle 4 according to the excitation wavelength that will use and target emission wavelength.For example, the light that sends when the white LEDs that uses in the common lighting device at liquid crystal indicator is during as excitation line, the light that is sent by the described lighting device pseudo-white light of being known as.The wavelength light characteristic of pseudo-white light has been shown among Fig. 7.As shown in FIG., described pseudo-white light has two crests.In this case, be used as phosphor microparticle 4 by 480nm to the optical excitation of 490nm and the phosphor of launching the light of 600nm.The relation of wavelength has been shown among Fig. 8.In other words, will adopt a kind of phosphor, it is located to have the optical excitation of crest and is transmitted in the light that 600nm (curve 16) locates to have crest to 490nm (curve 15) at 480nm.Illustrated among Fig. 9 by employing and had the pseudo-white light of characteristic shown in Figure 7 and illumination light wavelength-light characteristic that phosphor shown in Figure 8 obtains.When being chosen in the 625nm place and having the phosphor of crest of emission wavelength, can realize that the light wavelength that comprises longer wavelength distributes, and the lighting device that can obtain to have high Color reproduction ability, wherein at the 625nm place, lower from the ratio of the light of described white LEDs emission.
Described phosphor microparticle 4 is made of substrate, activator and solvent.Described substrate is selected from Phos---for example oxide, such as the sulfide of rare earth elements such as zinc, cadmium, magnesium, silicon, yttrium, silicate, and vanadic acid, or be selected from organophosphor---for example fluorescein, eosin and oil (mineral oil).Described activator is selected from silver, copper, manganese, chromium, europium, zinc, aluminium, lead, phosphorus, arsenic and gold.Described solvent is selected from sodium chloride, potassium chloride, magnesium carbonate and barium chloride.Described semitransparent thin film is approximately 25 μ m by thickness and forms to the translucent polymeric material of 500 μ m.Can use general resin for example PET (PETG), PC (Merlon), acrylic acid (class) resin and TAC (triacetyle-cellulose) as described translucent polymeric material.Can adopt translucent adhesive for example acryloid cement or epoxy adhesive as adhesive 2.These adhesives can be quenching adhesive, ultraviolet curing adhesive or air set adhesive.
[embodiment 2]
The structure of lighting device according to a second embodiment of the present invention has been shown among Fig. 2.Lighting device according to this embodiment is a so-called side light type lighting device, and wherein light source is in the side of photoconduction.As shown in FIG., phosphorus membrane 9 places between light source 6 and the photoconduction 7.The light that sends from light source 6 passes described phosphorus membrane 9 to be converted into the light of expection wavelength.Plate 8 and prism thin slice 5 penetrate from the emitting surface of lighting device the light that photoconduction 7 guiding is converted so that it is reflected.Identical with first embodiment, in described phosphorus membrane 9, on semitransparent thin film, form phosphor layer by hybrid phosphor particulate in adhesive.Described semitransparent thin film must be in the somewhere between the emitting surface of light source and lighting device.Fig. 3 shows the structure that photoconduction 7 is provided with phosphorus membrane 9.In this case, the light that sends from light source 6 is imported into the photoconduction 7, and the plate 8 that is reflected is from the upwards emission of described photoconduction 7.Described light passes described phosphorus membrane 9 to be converted into the light with expection wavelength.Light after the conversion passes prism thin slice 5 to become illumination light.
[the 3rd embodiment]
The structure of the display unit of a third embodiment in accordance with the invention has been shown among Fig. 4.In this embodiment, the side light type lighting device shown in Fig. 2 is used as the backlight of display unit.Used for liquid crystal display element is made display element.As shown in FIG., phosphorus membrane 9 places between light source 6 and the photoconduction 7.The light that sends from light source 6 passes described phosphorus membrane 9 to be converted into the light of the wavelength with expection.Light after will being changed by photoconduction 7, reflecting plate 8 and prism thin slice 5 imports the direction of liquid crystal display cells 10; And sample to send the light of Show Color by the light of the filter in the liquid crystal display cells 10 after to this conversion.
The transmissison characteristic of the filter of liquid crystal display cells has been shown among Fig. 6.The transmissison characteristic of the blue color filter in the filter is represented that by curve 11 transmissison characteristic of green color filter is represented that by curve 12 transmissison characteristic of red color filter is represented by curve 13.Curve 11 and curve 12 overlapping areas and curve 12 and curve 13 overlapping areas are filtering (cut) zone.The wavelength characteristic of white LEDs has been shown among Fig. 7.Can find with reference to Fig. 6 and 7, although as the secondary peak of the wavelength of the white LEDs of light source at about 570nm place, owing to this secondary peak is within the filtering wavelength region may of described filter, so energy efficiency is very low.
Example according to the wavelength conversion characteristics of phosphorus membrane of the present invention has been shown among Fig. 8.The excitation wavelength of the described phosphorus membrane of curve 15 expressions.This excitation wavelength has crest at the 480nm place.Equally, can find from Fig. 6 that the overwhelming majority of this wavelength is positioned at by within the zone of filter filtering.In other words, the overwhelming majority of light with excitation wavelength of phosphorus membrane will be absorbed by filter at first.On the other hand, be positioned within the zone of transmission peak wavelength of red color filter by phosphorus membrane wavelength of light emitted (curve 16).In other words, having is excited shows that the light of the wavelength of red and white can be effectively utilized, and can not absorbed by filter.
In the process of the phosphor of selecting phosphorus membrane, can be chosen in the excitation wavelength that the 580nm place has crest.The crest of emission wavelength must avoid 480nm to 510nm and 570nm to 590nm.In other words, the excitation wavelength of the phosphor that uses in described phosphorus membrane must be in the wavelength region may that is absorbed by filter, and emission wavelength must be avoided the big zone of filter uptake.According to the present invention, can effectively utilize the light that sends from light source.
When the emission wavelength of phosphor at 600nm or when more many places have crest, can compensate the low wavelength region may of ratio of the light that sends from white LEDs.Like this, just can improve the Color reproduction ability.
The display unit that upper surface with photoconduction 7 is provided with the structure of phosphorus membrane has been shown among Fig. 5.When described phosphorus membrane 9 is between photoconduction 7 and reflecting plate 8, can obtain same effect.In other words, send and arrive on any one light path of light of liquid crystal display cells 10, can reach effect of the present invention if phosphorus membrane 9 is arranged on from light source 6.Can on the upper surface of photoconduction 7, place diffusing globe and a plurality of prism thin slice.The combination of elements that is provided with on the upper surface of photoconduction 7 will change according to the illumination and the viewing angle characteristic of necessity.
In the above description, white LEDs is used as light source 6.Yet, also can use CCFL (cold-cathode fluorescence lamp).Under special circumstances, blue LED also can be used as light source 6, and is provided with to have on photoconduction 7 and is used to launch the thin film of phosphor of gold-tinted to obtain white light.Even under these circumstances, the present invention remains effective.Yet, after light bleaches, phosphorus membrane 9 must be set on light path.
In the present invention, describedly will be converted to the phosphorus membrane of the light that penetrates filter because adopted, so can obtain to have the lighting device of high-luminous-efficiency by the light that filter absorbs.Because selected such phosphor, this phosphor has the wavelength that less comprises in the white light source as emission wavelength, so can obtain to have the lighting device of very high Color reproduction ability.In other words, have such effect, that is: in many application, can adopt the light that light source is sent to carry out the phosphorus membrane of wavelength conversion, and can impel the power attenuation that reduces color light source, improve the Color reproduction ability.
Because can resist moisture in the environment according to the lighting device of the liquid crystal indicator of the foregoing description, therefore, this lighting device is applicable to the liquid crystal indicator that uses under hot and humid environment, for example the liquid crystal indicator of settling on the vehicle in summer.Can be by being used for the wall hanging lighting device that flat light device that general room or analog use obtains to have low power attenuation according to the lighting device of present embodiment.Its effect is: improved general lighting environment and also can economize on resources.
[the 4th embodiment]
The material that forms the watertight composition 3 shown in Fig. 1 can be a silicones, cyclenes resin, fluoride resin, and analog.Can also adopt inorganic waterproof material, for example: glass colloidal sol and silica.Although watertight composition 3 is thick more good more, watertight composition 3 works at about 5 μ m or bigger thickness place.Especially, when using the polymerization watertight composition, thickness must be equal to or greater than 20 μ m, preferably, is equal to or greater than 50 μ m.
Semitransparent thin film 1 constitutes by having the translucent polymeric material of about 25 μ m to the thickness of 500 μ m.This translucent polymeric material can be general resin, PET (PETG) for example, PC (Merlon), acrylic resin, or TAC (triacetyle-cellulose).Can be with acryloid cement, epobond epoxyn or analog are as adhesive 2.These adhesives can be quenching adhesive, ultraviolet curing adhesive or air set adhesive.Ordinary resin as semitransparent thin film 1 has high water penetration.Therefore, especially,, preferably will use silicones when the thickness of semitransparent thin film 1 is little during to 25 μ m to 100 μ m, the cyclenes resin, or fluoride resin is as watertight composition.
Suitably select the material of phosphor microparticle according to the excitation wavelength that will use and target emission wavelength.For example, if with blue light as exciting light and use yellow phosphorus that blue light is converted to gold-tinted to regulate intensity as the blue light of exciting light as phosphor microparticle 4, so, can mix the light that obtains to have expection colourity by the color of the light after exciting light and the wavelength conversion is carried out superposition.
(first specific embodiment)
PET film with thickness of 200 μ m is used as semitransparent thin film.On described PET film phosphor is set, this phosphor is by S base green phosphor particulate and S base red-emitting phosphor particulate are blended in the epoxy resin with 1: 1 ratio so that have total (by weight) cycles of concentration about epoxy resin of 40% and obtain.This phosphor layer is coated with the silicones that thickness is 100 μ m.In 90% and 60 ℃ environment, when measuring colourity, will check the variation of the colourity of film transmission ray, this light is to obtain on this sample (sample) by the blue light illumination that will come from blue LED.Then, in 1000 hours, all do not find to produce in this sample and worsen, but in 24 hours, deterioration has taken place in the same sample that watertight composition wherein is not set.
(second specific embodiment)
With thickness be 200 μ m the cyclenes resin (Zeonor: the title of the product of making by zeon company) as semitransparent thin film to form the phosphor layer identical with first specific embodiment.This phosphor layer is coated with the PTFE that thickness is 100 μ m (TFE) enamel.When using the mode identical to detect this sample, in 1000 hours, do not find to worsen with first specific embodiment.
[the 5th embodiment]
Cross-section structure according to the phosphorus membrane of fifth embodiment of the invention has been shown among Figure 10.The difference of this embodiment and first embodiment is that semitransparent thin film 1 is provided with second watertight composition.Can will be used as second watertight composition 17 with watertight composition 3 identical materials.Owing to form this second watertight composition 17 in such a manner, so even will common translucent thin membrane material for example PC be used as semitransparent thin film 1 and also can obtain gratifying waterproof effect.
(the 3rd specific embodiment)
On the PET film, form silicon dioxide gel with 5 μ m thickness for thickness with 50 μ m, and, the phosphor layer identical on described silicon dioxide gel, formed with first specific embodiment with 100 μ m thickness.On described phosphor layer, apply the epobond epoxyn that comprises fluorine, and its sclerosis is had the watertight composition 3 of 120 μ m thickness with formation.When the variation of the glow color of observing this sample in the mode identical with second specific embodiment, found yet to worsen through more than 1000 hours with first specific embodiment.
(the 4th specific embodiment)
Be to form the silicon dioxide gel that thickness is 2 μ m in the mode identical on PFA (the tetrafluoroethene perfluoro vinyl ether co-polymer) film of 100 μ m at thickness with the 3rd specific embodiment.Forming thickness on described silicon dioxide gel is phosphor layer and the fluorine silicon resin of 200 μ m.When estimating the colourity of glow color, do not find yet to worsen through more than 1000 hours.
[the 6th embodiment]
Figure 11 is the cross section view of demonstration according to the structure of the lighting device of sixth embodiment of the invention.As shown in figure 11, first phosphorus membrane 9 is between light source 6 and photoconduction 7.Second phosphorus membrane is between reflecting plate 8 and photoconduction 7.
On first phosphorus membrane 9 and second phosphorus membrane 18, be applied with the phosphor layer that uses different phosphor microparticles.Described phosphor layer is coated with watertight composition.Described first phosphorus membrane 9 and second phosphorus membrane 18 are the phosphorus membranes described in first embodiment and the 5th embodiment.Especially, in the present embodiment, in first phosphorus membrane 9, on translucent PETG (PET) film, has the red phosphor layer that is used for blue light wavelength is converted to ruddiness, it has second watertight composition, and with translucent silicone adhesive or epobond epoxyn as adhesive.On the surface of red phosphor layer, has first watertight composition.In second phosphorus membrane 18, on translucent PET film, have the colour filter phosphor layer that is used for blue light wavelength is converted to green glow, it has second watertight composition 17, and with the translucent silicone adhesive as base material.On the surface of described colour filter phosphor layer, has first watertight composition 3.
Because the light that is radiated on second phosphorus membrane 18 has uniform intensity, so can with homogeneous thickness phosphor layer be set on second phosphorus membrane 18.The phosphor layer that is provided with on first phosphorus membrane 9 must be arranged in the zone at least, and in this zone, the light that comes from light source 6 is illuminated.
On the other hand, usually, when the light with short wavelength was changed by wavelength, when the light wavelength that is obtained by the wavelength conversion increased, wavelength conversion efficiency descended.Therefore, when figuring for convert light, under the situation that wavelength after the conversion increases, must increase irradiates light intensity with same light intensity.Therefore, can near red-emitting phosphor being placed on light source 6, come effectively blue light to be converted to ruddiness.The red light absorption coefficient of the translucent polymeric material of formation photoconduction 7 wants high with green glow with comparing of blue light.Like this, even the long loss that also can reduce of the light path after the conversion up to the ruddiness of irradiation.
On the other hand, be used for blue light wavelength is converted to the wavelength conversion efficiency height of the green phosphor of green glow than red-emitting phosphor.Therefore, green phosphor is set and carries out the uniform wavelength conversion in second phosphorus membrane 18.
By this structure, can obtain to have the lighting device of big chromaticity range and fabulous humidity resistance.
[the 7th embodiment]
Structure according to the lighting device of seventh embodiment of the invention has been shown among Figure 12.In this embodiment, the back side of photoconduction 7 is provided with first phosphorus membrane 9, and the front surface of photoconduction 7 is provided with second phosphorus membrane 18.Blue LED with emission wavelength of 460nm is used as light source.Red-emitting phosphor is used to first phosphorus membrane 9, and green phosphor is used to second phosphorus membrane 18.By this structure, can obtain to have the lighting device of fabulous humidity resistance and big chromaticity range.
The blue light that passes first phosphorus membrane 9 is used as by twice and comes from the irradiates light of photoconduction 7 sides and the reverberation that comes from reflecting plate 8 sides.Like this, compare with the situation of blue light only being carried out a wavelength conversion, can reduce by half is included in the concentration of the phosphor in first phosphorus membrane 9.
In the present embodiment, the light of conduction in fact only is blue light in photoconduction 7.Like this, can be so that be easier to be designed for structure from the photoconduction of light emission surface irradiates light, thus can improve illumination efficiency and reduce the design delivery time.Therefore, on the light emission surface of photoconduction 7 or the back side, except making the prism group made good use of or good diffusing structure, can also use effectively hologram be used as photoconduction 2 in the light of transmission extract the outside and launch the device of light.Can be by utilizing the figure that lithography conversion obtains by two beam interferometer stripeds or utilizing lithography for example to form the computer hologram of Lippmann hologram and make described hologram at an easy rate.
In the present embodiment, also can directly on the reflecting surface of reflecting plate, form phosphor layer.As shown in figure 17, on the surface of reflecting plate 8, be formed with phosphor layer 20.
[the 8th embodiment]
Figure 13 is the profile of demonstration according to the structure of the lighting device of eighth embodiment of the invention.The difference of present embodiment and the 7th embodiment is that first phosphorus membrane 9 and second phosphorus membrane 18 all form on the light emission surface side of photoconduction 7.The uniformity that the light intensity of the light that sends from photoconduction 7 distributes is higher than 70%.Therefore, by such setting, can come homogenising to change the excitating light strength of generation and improve the color mixture characteristic by first phosphorus membrane 9 and second phosphorus membrane 18 by wavelength.In addition, can improve wavelength conversion efficiency as first phosphorus membrane 9 and employing green phosphor as second phosphorus membrane 18 by adopting red-emitting phosphor.
Compare with the situation of using the general phosphorus membrane that is not coated with watertight composition, can be by the lighting device that adopts phosphorus membrane according to the present invention to obtain to have fabulous humidity resistance.
[the 9th embodiment]
Sectional structure chart according to the lighting device of ninth embodiment of the invention has been shown among Figure 14.In the present embodiment, first phosphorus membrane 9 and second phosphorus membrane 18 are between the light incident surface of light source 6 and photoconduction 7.Under these circumstances, as the 8th embodiment, can improve wavelength conversion efficiency as first phosphorus membrane 9 and employing green phosphor as second phosphorus membrane 18 by adopting red-emitting phosphor.
In the present embodiment, because first phosphorus membrane 9 and second phosphorus membrane 18 are near light source 6, so the distribution of the light intensity of the light that shines on these phosphor layers is bigger.Because the light intensity of the light of being changed by wavelength in these phosphor layers and launching is higher in high that part of of excitating light strength, so, be reduced in high that part of of intensity penetrated in the illumination of exciting light at the thickness of the phosphor that applies on the phosphor layer, and in low that part of of intensity penetrated in the illumination of exciting light, being increased, thereby the radiative ratio that obtains fixing in fact exciting light and obtain by the wavelength conversion.
Can adopt such light source as light source 6, in this light source, the blue LED of the ultraviolet LED of emission near ultraviolet ray and emission blue light is provided with toward each other.Described ultraviolet LED has for example emission wavelength of 365nm.Because it is bigger to impose on the excitation energy of phosphor, so can carry out wavelength conversion efficiently.Yet the polymeric material that the composition of lighting device for example forms photoconduction 7 will absorb ultraviolet ray in a large number.Therefore, in photoconduction transmission ultraviolet ray and in big zone even excitation phosphor be difficult.So, as shown in Figure 14, if in the space between ultraviolet LED and photoconduction 7 phosphor layer is set, and the visible light after transmission is changed in photoconduction, then can raise the efficiency.
Figure 18 has demonstrated the CONCENTRATION DISTRIBUTION plane at the phosphor that is provided with under the situation that three light sources be arranged in parallel on first phosphorus membrane 9 and second phosphorus membrane 10.In Figure 18, the concentration of phosphor microparticle increases according to the order in zone 28,29 and 30.Has the highest irradiates light intensity with the corresponding zone 28 of the centre of luminescence of light source.Reducing from the described irradiates light intensity of centre of luminescence part far away.Usually, when irradiates light increases, phosphor will have the convert light composition of higher wavelength conversion efficiency and bigger quantity.Therefore, can obtain to have the illumination light that uniform look distributes by the concentration that increases the phosphor in the centre of luminescence of light source part far away.In the drawings, the zone of each light source is divided into three zones 28,29 and 30.Yet, when described zone is divided into the zone of more number more, may improve look and distribute.
Can by use with each zone accordingly the printed panel phosphor layer that utilizes serigraphy or offset printing sequentially to print to have different phosphor concentration to obtain such zone.In described phosphorus membrane 9, on the phosphor layer that forms by this way, form watertight composition to avoid the moisture effects phosphor microparticle in the environment.
The CONCENTRATION DISTRIBUTION of the phosphor that forms first phosphorus membrane 9 and second phosphorus membrane 18 is provided in Figure 14 in this way.Its feasible lighting device that can obtain to have fabulous humidity resistance and the gratifying high chroma characteristic and the gratifying mixture of colours.
[the 5th specific embodiment]
In Figure 14, three kinds of light sources 6 are set up in parallel, wherein ultraviolet LED and blue LED setting closer to each other and be encapsulated in the assembly.The emission wavelength of ultraviolet LED is set to 365nm, and the emission wavelength of blue LED is set to 460nm.At five stages of concentration serigraphy red-emitting phosphor particulate and with its sclerosis on semitransparent thin film, this red-emitting phosphor particulate has the distribution shown in Figure 18 and is blended in the adhesive.Further apply fluorine-containing epoxy resin on described red-emitting phosphor particulate, this fluorine-containing epoxy resin is hardened to form first phosphorus membrane 9.In the mode identical with first phosphorus membrane 9 by printing and sclerosis green phosphor and cover the phosphorus membrane that described green phosphor obtains with fluorine-containing epoxy resin and be used as second phosphorus membrane.
In this way, red-emitting phosphor and green phosphor are excited by ultraviolet LED, come from the light and the blue light that comes from blue LED of phosphor.Therefore, can obtain to have the lighting device of big Color reproduction scope and gratifying mixture of colours characteristic.Especially, the ultraviolet ray as exciting light can not influence Color reproduction.Must consider mixing of the ruddiness that is excited and green glow and the blue light that comes from blue-light source.Like this, can obtain such lighting device, in this lighting device, carry out the tone joint easily.
Ultraviolet ray impels the polymeric material of photoconduction 7 to produce and worsens lighting device parts during this photoconduction 7.When the illumination that mixes with ultraviolet ray was mapped on the liquid-crystal apparatus, liquid crystal can be worsened.Also can observer's eyes be had a negative impact in addition.Like this, although Figure 14 plants unclear the demonstration, in this particular example, between the light incident surface of second phosphorus membrane 18 and photoconduction 7, inserted the ultraviolet radiation absorption film.
[the tenth embodiment]
Figure 15 shows the perspective view according to the structure of the lighting device of the tenth embodiment of the present invention.In the present embodiment, the end, two ends of photoconductive tube 19 is provided with two blue-light source 6a and 6.The light beam that sends from these blue-light sources is conducted also homogenized by photoconductive tube 19, and by on the surface of the photoconductive tube 19 relative with photoconduction 7 or apparent surface that should the surface go up the prismatic reflection that is provided with, and be radiated at equably on the light incident surface of photoconduction 7, be directed to the inside of photoconduction 7 then.In lighting device, in photoconductive tube 19, be mixed with red-emitting phosphor according to present embodiment.Therefore, blue light is converted to ruddiness by wavelength in photoconductive tube 19, and can realize the uniform wavelength conversion and the mixture of colours.Except be repeated reflection in photoconductive tube 19, blue light also has high luminous intensity.It makes can carry out wavelength conversion efficiently.Forming the watertight composition (not shown) on the whole surface of photoconductive tube 19 is worsened by the moisture in the environment to avoid the red-emitting phosphor particulate in the red pipe 19.
On the other hand, the back side of photoconduction 7 is provided with second phosphorus membrane 18 described in first embodiment or the 5th embodiment.On the surface of described second phosphorus membrane 18, be formed uniformly green phosphor layer.In addition, the surface coverage of this green phosphor layer has watertight composition.By such structure, can obtain to have the lighting device of fabulous humidity resistance and gratifying colorimetric properties and mixture of colours characteristic.
[the 11 embodiment]
Figure 16 shows the perspective view according to the structure of the lighting device of the 11st embodiment of the present invention.The difference of this embodiment and the 7th embodiment is that second phosphorus membrane 18 is inserted between the light incident surface of photoconductive tube 19 and photoconduction 7.As described in the 7th embodiment, the red-emitting phosphor that mixes in photoconductive tube 19 utilizes uniform, strong blue light in the photoconductive tube 19 with blue light wavelength conversion position ruddiness effectively.Can mix blue light and ruddiness fully, equably in the inside of photoconductive tube.In addition, owing to the light that shines the light incident surface side of photoconduction 7 from photoconductive tube 19 is uniformly, so the phosphor layer that is provided with on second phosphor layer 18 also can only be uniform.Compare with the 7th embodiment,, therefore have an advantage, that is: can effectively blue light be converted to green glow because the light intensity that is radiated on second phosphorus membrane 18 is higher.Because compare the area that can reduce second phosphorus membrane 18, so can reduce the quantity of the phosphor that will use and reduce the manufacturing cost of lighting device with the 7th embodiment.
In this way, in the present embodiment, as above described in the embodiment, the lighting device that can use the phosphor of lesser amt to obtain to have fabulous humidity resistance and gratifying colorimetric properties and mixture of colours characteristic.
[the 12 embodiment]
Among the 11 embodiment shown in Figure 16, the phosphor that is provided with on the surface of second phosphorus membrane 18 must be uniform.Under these circumstances, for example, when with red-emitting phosphor blue light wavelength being converted to ruddiness, because wavelength changes necessary energy and be absorbed, so the intensity of blue light weakens.To have more low intensive blue light illumination is poor efficiency blue light wavelength is converted to green glow to the green phosphor.Like this, in the present embodiment, on film surface, divide the zone of red-emitting phosphor and green phosphor, and it optionally is printed on second phosphorus membrane 18 to avoid it to overlap each other.So just make and to effectively utilize excitation line.The specific set-up mode of red phosphorescent body region and green phosphorescent body region has been shown among Figure 19.As shown in figure 19, on semitransparent thin film 1 with being spatially separated from each other the printing red-emitting phosphor apply the zone 22 and green phosphor apply the zone 23.Use the silk screen printing of the figure shown in Figure 19 to have the red-emitting phosphor in the zones of different of being dispersed in or the adhesive of green phosphor.This adhesive further is coated with watertight composition.By such structure, need not phosphor blend is dispersed in the photoconductive tube 19, and only use a phosphorus membrane just can carry out the wavelength conversion to two wavelength that come from a light source effectively.Different phosphor can enough satisfaction the excitation line of intensity carry out the wavelength conversion, thereby and can not absorb excitation line and weaken each other intensity.
In Figure 19, the shape in the zone that be divided must not be a rectangle, also can be a shape or polygonal.Can easily regulate the light intensity that to be changed by wavelength by the superficial density of regulating the zone divided.The thickness of the phosphor layer that is printed also can change with the concentration that is dispersed in the phosphor microparticle in the adhesive.
In order to carry out the sufficient mixture of colours, printing zone is preferably as much as possible little.Can by use serigraphy, offset printing or ink jet printing method with the size adjustment of printing zone in the scope of 50 μ m to 200 μ m arbitrary dimension and carry out the abundant mixture of colours.The size that can be by changing printing zone and the phosphor microparticle concentration of zones of different easily realize the structure of phosphor layer, and this phosphor layer has the phosphor concentration shown in Figure 18 in fact and distributes.
Obviously, even when phosphor layer is not set between the light incident surface of light source and photoconduction, also can disperse to form the phosphor structure realm.
As mentioned above, can obtain according to lighting device of the present invention, this lighting device has fabulous humidity resistance and gratifying colorimetric properties and mixture of colours characteristic.By in the high-resolution liquid crystal indicator, using this lighting device, not only can improve the colorimetric properties and the humidity resistance of liquid crystal indicator, can also realize the increase of brightness.
Obviously, not only can be with phosphorus membrane according to the present invention and lighting device lighting device as liquid crystal indicator, can also be as general flat light light source and general lighting device.
[the 13 embodiment]
Structure according to the display unit of the 13rd embodiment of the present invention has been shown among Figure 22.The lighting device of the structure that has in the foregoing description to be put down in writing is used to the liquid crystal display cells that throws light on.Above photoconduction 7, be provided with scattering object 26, above scattering object 26, be provided with liquid crystal display cells 25.Below photoconduction 7, be provided with reflecting plate 8.These parts are protected by housing 27 and are being supported.The light source of installing on circuit base plate 24 6 is set at an end of photoconduction 7.This light source 6 and photoconduction 7 over against.Although not shown among Figure 22, much less, phosphorus membrane can be arranged on photoconduction 7 certain position on every side with mode same as the previously described embodiments.
Claims (3)
1. display unit comprises:
Lighting device;
Have the display element of filter, it is shone by lighting device;
Phosphor layer, wherein phosphor microparticle is dispersed in the adhesive; And
Be used to clamp the semitransparent thin film and the watertight composition of described phosphor layer;
Wherein said phosphor microparticle has excitation wavelength and emission wavelength, and described excitation wavelength is in the wavelength region may that is absorbed by described filter, and described emission wavelength passes the zone of described filter.
2. according to the display unit of claim 1, wherein:
Described filter is made of redness, green and blue color filter; And
Described excitation wavelength has crest at 480nm to 490nm, and described emission wavelength has crest at 600nm.
3. according to the display unit of claim 1, wherein:
Described lighting device is emitted in the light that comprises two crests in the visible region; And
Described phosphor microparticle is by the optical excitation in the wavelength region may of any one crest of described two crests of this light, and sends the interior light of wavelength region may except that described two crests.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005159132 | 2005-05-31 | ||
| JP2005159132A JP4469307B2 (en) | 2005-05-31 | 2005-05-31 | Display device |
| JP2005182851 | 2005-06-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1880839A CN1880839A (en) | 2006-12-20 |
| CN100559066C true CN100559066C (en) | 2009-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100886111A Expired - Fee Related CN100559066C (en) | 2005-05-31 | 2006-05-31 | Phosphorus membrane uses its lighting device and display unit |
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| Country | Link |
|---|---|
| JP (1) | JP4469307B2 (en) |
| CN (1) | CN100559066C (en) |
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| CN102797993B (en) * | 2011-05-27 | 2016-12-14 | Lg伊诺特有限公司 | Lighting module |
| CN105793745B (en) * | 2013-12-09 | 2018-06-01 | 柯尼卡美能达株式会社 | The manufacturing method of optical film and optical film |
| CN105793745A (en) * | 2013-12-09 | 2016-07-20 | 柯尼卡美能达株式会社 | Optical film and method for producing optical film |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4469307B2 (en) | 2010-05-26 |
| JP2006338901A (en) | 2006-12-14 |
| CN1880839A (en) | 2006-12-20 |
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